Thermocouples? - Anyone Using Them

[Thinker_007]

Is anyone here using thermocouples in their applications?  I have been using some probes that output a 0-5 volt temperature signal but will be making the change to thermocouples soon.  I am wondering if anyone has tips on what shield or what add on hardware is easiest to get running with the LIFA platform.  Has anyone done this yet?  My main concern is having enough resolution in the A to D conversion to maintain good resolution over the thermocouple range, hence the add on hardware.  Any tips?

[cpalka]

Hi

I only know this cheaper solution http://www.sparkfun.com/datasheets/IC/MAX6675.pdf.

king regards

cpalha

[Thinker_007]

I have seen this solution but never used it.  I guess the next question is if anyone has done SPI on LIFA and if it works.

[hrh1818]

There is also the Max31855 which has a higer measurement temperature range and a 14 bit AD converter.

<http://www.maximintegrated.com/datasheet/index.mvp/id/7273>

For a thermocouple amplifier there is the AD8495:

<http://www.analog.com/en/mems-sensors/digital-temperature-sensors/ad8495/products/product.html>

hrh1818

[mknix]

Hi,

I also need to use thermocouples with my arduino and LIFA.

I've just ordered some MAX6675 anb MAX31855 ICs,

I'll post here if I manage to do something that works. (it's also my first time using SPI).

I'am interested also in getting your results Thinker_007

regards

antoine

[cpalka]

Hi

I use a lot of thermocouples all days, but with other equipements.

For this do you know the lm35? Is the chepeast temperature sensor and you need to supply 5 volts and you have an output in milivolts x100 =ºC

Arduino uno has 6 analogue pins so you can connect 6 lm5 sensors.

Of course the thermocouple is quite simple to work, but it is not easy to put our boards reading it.

cpalha

[Thinker_007]

Yes I haev been using some of these

http://labjack.com/support/ei-1022/datasheet

I believe it is based upon the LM35.  They work well but I would like a little bit better resolution than they offer.

[mknix]

I just found this :

https://decibel.ni.com/content/thread/13655?start=45&tstart=0

I've not gone through the whole thread yet, but I think it could be a great help...

cheers

Antoine

[t0r3r0s]

Have anyone VI for thermocouples and arduino ???